Here's a video where you can see when you pause how to connect the damper DX7
can help you.
Here are different variants of DX7 dampers https://www.google.com.ua/search?biw=1680&bih=919&tbm=isch&sa=1&ei=KHbfWvCAMs7nsAGd3oiICg&q=damper+DX7+uv&oq=damper+DX7+uv&gs_l=psy-ab.12...93559.101696.0.103154.7.5.2.0.0.0.98.427.5.5.0....0...1c.1.64.psy-ab..0.2.104...0i30k1.0.4NFUQq10grI

I once saw the work of EPSON 3800, the printer had the entire ink pump removed. The printer worked straight from the ink tanks. And the air pump was connected to each tank. Air pressure pushes out ink and creates ink pressure in the printer head and the printer does not install an ink error and uses this damper https://ru.aliexpress.com/item/10pcs-lot-printer-DX7-UV-ink-damper-for-Epson-B500-B510-B508-B300-B310-DX7-UV/32711892408.html?spm=a2g0v.10010108.1000023.9.5d5a4608POMNEy